basic

Reaction Quotient Q from Concentrations Calculator

Compare Q to K to predict reaction direction.

Calculates Qc for a general reaction aA + bB ⇌ cC + dD as Qc = [C]^c[D]^d / ([A]^a[B]^b), then compares to K to determine if the reaction proceeds forward, reverse, or is at equilibrium.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

mol/L
mol/L
mol/L
mol/L

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Qc = [C]ᶜ[D]ᵈ / ([A]ᵃ[B]ᵇ)

In depth

Calculates Qc for a general reaction aA + bB ⇌ cC + dD as Qc = [C]^c[D]^d / ([A]^a[B]^b), then compares to K to determine if the reaction proceeds forward, reverse, or is at equilibrium.